The Colt AR15-A4 — the factory Colt civilian variant of the M16A4 service rifle, re-issued with a 20" government-profile chrome-lined barrel, flat-top receiver, and A2 fixed buttstock.
The M16A4 was the last iteration of the full-length M16 in US military service — a 20" barreled, flat-top rifle that replaced the M16A2's integrated carry handle with a Picatinny rail for mounting optics. It served as the standard infantry rifle for the US Marine Corps through much of the Global War on Terror, typically paired with a Trijicon ACOG RCO. The Colt AR15-A4 is the semi-automatic civilian counterpart, retaining the same receiver dimensions, barrel profile, handguard geometry, and furniture as the military M16A4 but operating in semi-auto only.
Colt re-issued the AR15-A4 after a lengthy production hiatus, making it one of the few currently available factory Colt rifles with the full 20" government-profile barrel. The upper receiver is forged 7075-T6 aluminum — Colt sources forgings from various suppliers, so receivers may carry either the square forge mark or the keyhole forge mark, and may or may not include CAGE Code markings depending on the production run. The lower is marked "AR15 A4" with a CAR-prefix serial number. The 0.75" F-height A-frame front sight base is factory-installed and taper-pinned.
For clone builders, the AR15-A4 provides a factory Colt foundation for an M16A4-pattern build. Adding a KAC M5 RAS rail system, Trijicon TA31 ACOG, and AN/PEQ-15 transforms it into a close approximation of the USMC's standard M16A4 configuration from the mid-2000s onward. The flat-top receiver also makes this a natural starting point for a Mk12 SPR or recce-style build that calls for a 20" barrel.
See also the 2021 production AR15 CR6700 for another variant.
We stock factory Colt rifles when they come available — they don't sit long. Order yours today and own a piece of Colt history.
This item is a firearm and must ship to an FFL holder. No civilian exceptions.
1) Check your state laws to confirm the item is legal in your state.
2) Have your FFL dealer send a copy of their FFL to Charlie's.
3) Be patient — you should hear from our compliance department within 3–4 business days.
Please click the "Buying a Firearm" tab at the top of this page for more information.
This rifle cannot be shipped to California.
Free shipping option does not apply to full rifles.
THIS IS A SERIALIZED FIREARM. It must ship to a Federal Firearms License holder. No civilian exceptions.
Buying and shipping through Charlie’s is easy, but there is some information you need to know. Only a federally licensed firearms dealer may receive a firearm or federally regulated serialized item (like a receiver or suppressor). We cannot ship these items directly to you. Please follow these steps to process your transaction:
1) Check your state laws to make sure the federally regulated item you want to purchase is legal in your state. Your FFL dealer should be able to give you all of the necessary information regarding your state specific laws. But, if we ship to your FFL, and there is a legal issue, we cannot accept a return. So please make sure that you know and follow your local and state laws.
2) A quick google search will show you what Federal Firearms Licensed (FFL) dealers are in your area. When you are ready to purchase, contact the FFL dealer you would like to use and get their shipping address. During the check-out, put YOUR address in the “billing” section and the FFL DEALER’S address in the “shipping” section. If you don’t know your FFLs address, that’s okay. You can send the information later.
3) After check out, make sure to contact your FFL dealer to ensure they will receive your shipment for you (most do this for a small fee, but you should always double check).
4) Have your dealer send us a copy of their FFL to FFL@CharliesCustomClones.com. Charlie’s does not reach to your FFL (MAKE THEM EARN THEIR FEE!!!)
5) Be patient! In order to ensure we remain compliant with all federal laws, our compliance department is kept separate from our sales and operations team. Please allow a few days for our compliance officer to verify all of your dealer’s documents and ensure all federal laws are being observed. You should hear from our compliance department within 3-4 business days. If not, feel free to reach out for a status update.
That’s it! We try to make this process as simple as possible for our customers, but if you are unfamiliar the process or have any other questions, please visit our How to Buy a Firearm page for more details.
California and New York residents please, click here. The process may be different due to state specific laws.
NOTE: The free shipping option does not apply to full rifles, unless purchased with a riflescope. If you choose free shipping at check-out, we will bill you for shipping later.
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